Brian Ashcraft

You've probably seen the clip of the young lady who played porn in a quiet library. And maybe you thought, hey, I'm an evil trickster, and I'd like to do something similar as a prank. Well evil trickster, here's how*.

Go Yoshiwara, vice-president of a Tokyo web design firm, rigged one of his employee's computers to play porn after booting up. You can watch the embarrassing hijinks in the above video (it's porn so it's probably not work safe—which is the point).

Yoshiwara gave a step-by-step walk through for replicating his prank on a PC running Windows 7.

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First, connect the PC to speakers and turn those speakers up to full blast. Second, disable the standard Windows startup sound through the sound settings: Start->Control Panel->Sound.

Then, in the Sound tab, either select "Disable All Sound" or uncheck the "Play Windows Startup Sound". This displays the Windows sound so the moaning and groaning will be crisp and clear.

Next, download porn. You should know how to do this.

After that, set the downloaded dirty clip as the Startup Program by simply dragging the file to the Startup Program folder in the Start Menu bar.

To ensure maximum embarrassment, Yoshiwara says to remove the mouse from the USB port, so the pranked individual cannot close the clip with a quick mouse click; however, this could give up your ruse if, after entering his or her password, the person clicks the "Sign In" button with the mouse instead of simply hitting Enter.